Switching home loans: the Australian refinancing checklist that actually pencils

A 0.35 percentage point cut on the headline rate looks like free money on the comparison page. On a $600,000 loan that rate gap is worth about $2,100 a year of interest saved. The switching costs to capture it run to $2,000 or $3,000 in year one, and if your equity has slipped below 20% the new lender will quietly re-charge Lenders Mortgage Insurance and wipe out three years of saving in a single line item.

Refinancing in Australia is a real lever and a real trap. Here is what is actually worth switching for, the costs to model honestly, the traps that kill the deal, and the order of operations that gets a refinance settled in 4 to 6 weeks.

When refinancing is actually worth it

The deciding number is not the rate gap. It is the absolute dollar saving over the period you realistically expect to stay in the property, minus the switching costs paid in year one. A 0.35 percentage point cut on $600,000 saves roughly $2,100 a year. The same cut on a $250,000 balance saves $875. The first deal pencils after one year. The second takes three or four years to clear costs and only makes sense if you plan to stay put that long.

A useful rule for owner-occupiers: if the absolute annual saving clears the switching costs within 18 months, the refinance is worth doing. If it takes longer than three years to break even, the rate gap probably is not the right lever and you should be looking at offset structure, loan term, or a different lender category instead.

Investors run a different calculation because interest is deductible. A $2,100 gross saving is worth about $1,323 after tax to a 37% marginal-rate investor. Switching costs for an investment loan are mostly deductible too (the discharge and establishment portions are deductible in the year incurred; mortgage registration is a capital cost), so the after-tax break-even is closer than the gross numbers suggest.

The switching costs to model

Every refinance carries the same five line items. Get quotes for all of them before you make the decision; do not rely on the new lender's "costs covered" marketing without checking what is actually covered.

Discharge fee from the current lender.Typically $300 to $400, sometimes called a loan-discharge admin fee or settlement fee. Mandatory and non-negotiable.

Application or establishment fee at the new lender. Ranges from $0 to about $700. Major banks often waive this on package products; smaller lenders and non-bank lenders sometimes charge it as a one-off and offer a sharper rate in return.

Settlement fee at the new lender. $300 to $400 to cover the legal-and-administrative work of registering the new mortgage and paying out the old one. A few lenders bundle this into the establishment fee; most list it separately.

Valuation fee. $0 to $500. Most major lenders offer a free desktop valuation on standard properties in metro postcodes and charge for a full physical valuation on anything unusual (acreage, off-the- plan, regional towns, high-density apartments in a watch- list postcode).

Mortgage registration fees with the state Land Registry.$150 to $300 depending on the state. These are statutory charges, paid twice in a refinance: once to deregister the old mortgage, once to register the new one. NSW and Victoria sit at the higher end of the range, smaller states at the lower end. Non-negotiable and a genuine cash cost even when the lender markets "no fees to switch."

Total realistic switching cost on a standard owner-occupier loan with no LMI top-up: $750 at the cheap end (free establishment, free valuation, two registration fees and a discharge), $2,000 at the expensive end (all fees applied in full). Use $1,500 as a working estimate for the break-even check.

Break-even worked example

A borrower with $600,000 remaining on a 25-year loan at 6.30% gets an offer from a new lender at 5.95%. The current repayment is $3,978 a month. The new repayment is $3,856 a month. Monthly saving is $122. Annual saving in year one is about $1,464 of cashflow and roughly $2,100 of interest saved over the year (the interest saving is bigger than the repayment saving because some of the lower repayment is now paying down more principal).

Switching costs come in at $1,500. The refinance breaks even on cashflow in 12 to 13 months and on total interest saved inside year one. Over five years the borrower has saved roughly $10,500 in interest and given back $1,500 in switching costs, for a net $9,000. That is a clear win.

Run the same exercise on a $250,000 balance at the same rate gap. Annual interest saving is about $875. Switching costs are still $1,500. The borrower is in the hole for the first 21 months and only starts compounding a real benefit in year two. If they intend to sell or refinance again inside two years, the deal does not pencil. Sanity-check your own numbers with the loan comparison calculator before signing anything.

The 80% LVR trap (this kills the most refinances)

Lenders Mortgage Insurance is a one-off premium charged when a loan exceeds 80% of the property's value at approval. It is not transferable between lenders. If your original loan had LMI and the new lender approves above 80% LVR on the new valuation, you pay a second LMI premium from scratch, calculated on the new loan amount and new LVR band.

On a $600,000 loan at 85% LVR, the new LMI premium is roughly $10,000 to $14,000 depending on the insurer and the loan band. That is six to seven years of interest saving consumed by a single charge on the settlement statement. The deal stops being a refinance and starts being a $10,000 mistake.

Three ways out. First, check the valuation early. Property appreciation since you bought may have lifted equity above 20% already, in which case there is no LMI problem to solve. Second, contribute cash at settlement to bring the new LVR below 80%, if you have the funds to deploy and the rate saving makes that a sensible use of capital. Third, wait. If you are within $20,000 of the 80% threshold and market growth has been steady, six to twelve more months of repayments may put you the right side of the line without contributing cash at all. Our explainer on LMI in Australia walks through the premium bands and the bracket effects that show up around each LVR step.

Cash-back offers

Cash-back at settlement has been a fixture of the Australian refinance market since 2023 and is still being offered widely in 2026, usually in the $2,000 to $4,000 range. Treat the cash-back as a direct offset to the switching costs in your break-even calculation, not as a bonus on top of a rate saving.

Worked example. A marginal refinance with $1,500 of costs and a $1,464 annual cashflow saving has a break-even of roughly 12 months without cash-back. Drop a $3,000 cash-back on top and the deal is $1,500 in front on day one, with $1,464 a year of saving piling up from there. That changes a 12-month break-even into an instant win and is the reason cash-back deals genuinely tip borderline refinances over the line.

Two cautions. Most cash-back offers require minimum loan amounts ($250,000 is the common floor, $500,000 for the better deals) and clawback provisions if you refinance away inside 2 to 4 years. Read the clawback terms before treating the cash as a hard offset.

Rate vs comparison rate

The headline rate is what the bank charges on the loan balance. The comparison rate bundles fees, charges, and the headline rate into a single annualised figure on a standardised $150,000 loan over 25 years. Comparison rate is the closest you get to a like-for-like apples comparison between lenders without modelling every fee yourself.

A loan at 5.95% headline with $400 of annual fees has a comparison rate around 6.05%. A loan at 5.99% headline with no annual fee has a comparison rate around 6.01%. The headline-rate winner is the worse deal once fees are in. On larger loan balances the fee shrinks as a percentage and the headline rate wins back, so always sanity-check the comparison rate calculation against your actual balance. The comparison rate calculator does this for you.

Pre-approval before switching

Most lenders will give a conditional approval (sometimes called pre-approval, sometimes a formal loan offer) before you formally discharge from your existing lender. This is the right way to do it. Apply, get assessed, get a written approval at a specific rate, then start the discharge process at the old lender. Doing it the other way around leaves a gap between discharge and new settlement where you have no loan facility and no certainty.

Conditional approval triggers a hard credit enquiry that sits on your file for five years. Two or three enquiries across a six-month window is normal and not a problem. Six or seven hits in the same window starts to flag adversely on lender scorecards, so do not shop the application at eight different banks just to compare offers; do that work via a broker or against published rate cards before applying anywhere.

The APRA serviceability buffer at refinance

The biggest reason refinances fall over at the formal- application stage in 2026 is the serviceability re- assessment. The new lender does not just verify your previous loan was serviced. They run the full APRA model against your current income, current expenses, current debts, and a buffered rate that sits 3 percentage points above the loan you are applying for. On a 5.95% target rate the buffered assessment rate is 8.95%.

Five years of life happens between original approval and refinance. A second child, a partner moving to part-time, a car loan, a higher credit-card limit, a HELP balance that has not moved much: any of these can break the serviceability test even when the new rate is plainly lower than the old one. The lender does not care that you have been servicing the existing loan for years. They care whether your file passes their model today.

Two practical implications. Run the buffered repayment through your household budget before applying. If your income has fallen since the last assessment, expect to either refinance to a smaller loan amount (paying down the difference in cash at settlement) or fail outright. The explainer on the APRA serviceability buffer walks through what the buffered assessment actually calculates and where the margins sit.

The discharge process and timeline

Once you accept the new lender's offer, the discharge typically runs 3 to 6 weeks. The mechanics are:

• Sign loan documents with the new lender and return them.
• Authorise the new lender (via their solicitor or settlement agent) to request a payout figure from the existing lender.
• The existing lender prepares a discharge authority form, which you sign and return. Some lenders insist on original signatures, which adds a week.
• Both lenders book a simultaneous settlement on PEXA. The new loan funds, the payout is sent to the old lender, the old mortgage is deregistered and the new one registered. All of this happens electronically inside a 90-minute window on settlement day.
• Your direct debits switch to the new account. Cancel the old direct debit authority after settlement clears (typically 1 to 2 business days) to avoid a duplicate payment.

Common delays: original-signature requirements at the old lender, valuation issues at the new lender (the property valued lower than expected), and incomplete document packs from the borrower. The fastest refinances complete in 21 days; the slowest stretch to 8 weeks. Plan for 4 to 5 weeks and you will be inside the window.

The refinance checklist

1. Pull your current loan's contracted rate, balance, remaining term, and any fixed-rate period or break-fee exposure from your last statement.
2. Estimate your current LVR by checking the property value against the loan balance. If you are inside the 80% line on your own estimate, the LMI trap is unlikely to bite. If you are close, get a desktop valuation from a broker or a free online valuation report.
3. Shortlist two or three lenders based on advertised rates for your loan size and LVR band. Check the comparison rate, not just the headline.
4. Get the full fee schedule from each shortlisted lender. Add discharge ($350), settlement ($350), valuation, and registration fees ($150 to $300 your state) into a single switching-cost line.
5. Calculate break-even: annual interest saving versus switching costs minus any cash-back. If break-even is under 18 months, proceed. Between 18 and 36 months, marginal. Over 36 months, probably not worth it unless the new loan structure (offset, redraw, package) gives you something the old one did not.
6. Run the buffered repayment through your budget. If the new rate plus 3 percentage points is genuinely affordable on current income and expenses, the serviceability assessment should pass.
7. Submit to your preferred lender, get conditional approval, then formally discharge. Do not skip the conditional-approval step.
8. Track the settlement date and switch direct debits the business day after settlement clears.

The decision in one paragraph

A refinance pencils when the annual interest saving clears the switching costs inside 18 months, the new lender will approve at 80% LVR or below without re-charging LMI, your household passes the APRA buffer on the new rate, and any cash-back is large enough to cover incidental costs you forgot to model. If all four boxes tick, the saving over the remaining loan term is real and large. If any one of them fails, the deal is either a small win, a wash, or a loss dressed up as a rate cut. Use the loan comparison calculator to settle the numbers, and the companion piece on offset vs redraw if the refinance is also a chance to fix your loan structure, not just the rate.